The certified hygienic design of the model DMSU22SA in-line process transmitter fulfils the constantly growing requirements for process monitoring on plant for sanitary applications. Measurement is done by means of a deformation of the inner sensor tube of the double-tube system due to the applied pressure. This deformation produces a signal change, which the transmitter converts into the measuring signal. This version combines the demands for digitalisation and process reliability. Versions with HART® protocol are able to transmit not only the measuring signal, but also the status of the continuous sensor monitoring of the double-tube system to the process control system as required.